const { DataTypes } = require('sequelize');
const { sequelize } = require('../config/database');

const GrammarMediaStory = sequelize.define('GrammarMediaStory', {
  id: {
    type: DataTypes.UUID,
    defaultValue: DataTypes.UUIDV4,
    primaryKey: true
  },
  grammar_id: {
    type: DataTypes.UUID,
    allowNull: false,
    references: {
      model: 'grammars',
      key: 'id'
    },
    onDelete: 'CASCADE',
    comment: 'Foreign key to grammars table'
  },
  story_id: {
    type: DataTypes.STRING(100),
    allowNull: false,
    comment: 'Unique story identifier (e.g., "st-01")'
  },
  title: {
    type: DataTypes.STRING(200),
    allowNull: false,
    comment: 'Story title'
  },
  type: {
    type: DataTypes.ENUM('story', 'video', 'animation', 'audio'),
    allowNull: false,
    defaultValue: 'story',
    comment: 'Media type'
  },
  url: {
    type: DataTypes.STRING(500),
    allowNull: false,
    comment: 'Single URL to the complete media file'
  },
  thumbnail: {
    type: DataTypes.STRING(500),
    allowNull: true,
    comment: 'Thumbnail image URL'
  },
  description: {
    type: DataTypes.TEXT,
    allowNull: true,
    comment: 'Story description'
  },
  duration_seconds: {
    type: DataTypes.INTEGER,
    allowNull: true,
    comment: 'Media duration in seconds'
  },
  min_grade: {
    type: DataTypes.INTEGER,
    allowNull: true,
    comment: 'Minimum grade level for this story'
  }
}, {
  tableName: 'grammar_media_stories',
  timestamps: true,
  indexes: [
    { fields: ['grammar_id'] },
    { fields: ['story_id'] },
    { fields: ['type'] }
  ]
});

module.exports = GrammarMediaStory;